Bird Use of Cottonwood-Willow patches in the Lower Colorado River valley.

Persistent Link:
http://hdl.handle.net/10150/192095
Title:
Bird Use of Cottonwood-Willow patches in the Lower Colorado River valley.
Author:
Lynn, Suellen,1968-
Issue Date:
1996
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
Neotropical migratory birds and riparian forests have decreased in abundance over the past century. Decreases in bird populations have been linked to forest fragmentation. I performed bird surveys and monitored nesting success of Bell's Vireos (Vireo bellii) and Yellow-breasted Chats (Icteria virens) in a range of cottonwood/willow patch sizes and densities in the lower Colorado River valley to determine whether bird abundances, species richness, and reproductive success were related to cottonwood/willow patch size and/or tree density. Results suggest that neotropical migrants responded to patch size and tree density more than did resident birds. Results of breeding analyses suggest that small patches may be ecological sinks. Analyses excluding large patches indicated a threshold between 13 and 160 ha at which bird abundances stopped increasing with increasing patch size. This study demonstrated that neotropical migratory birds use small patches; however, large, dense patches are required for persistence of breeding populations.
Type:
Thesis-Reproduction (electronic); text
LCSH Subjects:
Hydrology.; Cottonwood.; Land use -- Colorado River Valley (Colo.-Mexico)
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Renewable Natural Resources; Graduate College
Degree Grantor:
University of Arizona
Committee Chair:
Morrison, Michael L.

Full metadata record

DC FieldValue Language
dc.language.isoenen_US
dc.titleBird Use of Cottonwood-Willow patches in the Lower Colorado River valley.en_US
dc.creatorLynn, Suellen,1968-en_US
dc.contributor.authorLynn, Suellen,1968-en_US
dc.date.issued1996en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractNeotropical migratory birds and riparian forests have decreased in abundance over the past century. Decreases in bird populations have been linked to forest fragmentation. I performed bird surveys and monitored nesting success of Bell's Vireos (Vireo bellii) and Yellow-breasted Chats (Icteria virens) in a range of cottonwood/willow patch sizes and densities in the lower Colorado River valley to determine whether bird abundances, species richness, and reproductive success were related to cottonwood/willow patch size and/or tree density. Results suggest that neotropical migrants responded to patch size and tree density more than did resident birds. Results of breeding analyses suggest that small patches may be ecological sinks. Analyses excluding large patches indicated a threshold between 13 and 160 ha at which bird abundances stopped increasing with increasing patch size. This study demonstrated that neotropical migratory birds use small patches; however, large, dense patches are required for persistence of breeding populations.en_US
dc.description.notehydrology collectionen_US
dc.typeThesis-Reproduction (electronic)en_US
dc.typetexten_US
dc.subject.lcshHydrology.en_US
dc.subject.lcshCottonwood.en_US
dc.subject.lcshLand use -- Colorado River Valley (Colo.-Mexico)en_US
thesis.degree.nameM.S.en_US
thesis.degree.levelmastersen_US
thesis.degree.disciplineRenewable Natural Resourcesen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.chairMorrison, Michael L.en_US
dc.contributor.committeememberGuertin, D. Philipen_US
dc.contributor.committeememberMannan, R. Williamen_US
dc.identifier.oclc213465425en_US
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